Yeah a fake livestream of Elon Musk or Mike Saylor still makes hundreds of thousands of dollars/day undetected and untraced, no FBI involvement or arrests at all, still going strong to this day. Why waste time with this crap.
Most of the time they do get removed - sometimes successfully before the QRcode is displayed. They even bot the streams so it appears like 30-40k people are watching creating 'social proof'
Another option is a Kafkaesque reporting mechanism in which a scammer took down their own videos before they could be reviewed by moderators. This is rarer but possible.